Bently Nevada 21000-34-05-00-056-04-02 Proximity Probe Housing Assemblies

Parameter
Model: 21000-34-05-00-056-04-02 Proximity Probe Housing Assemblies
Probe with Connector: 34-33300 XL 8mm probe with connector protector, selectable hazardous area approvals
Probe Cable Length: 05-0.5 m (20 in)
Standoff Adapter (Option C Dimension): 00-00 mm
Probe Penetration (Option D Dimension): 056-5.6 in
Fittings: 04-One 3/4-14 NPT plug only
Mounting Thread: 02-3/4-14 NPT

Description

The Bently Nevada 21000-34-05-00-056-04-02 is a 21000 Proximity Probe Housing Assembly designed for externally mounting proximity probes on rotating machinery while providing mechanical protection and convenient access for installation and maintenance. The assembly consists of an aluminum housing body, a 304 stainless steel probe sleeve, a dome cover, O-rings, threaded conduit ports, and sealing components, forming a durable enclosure for proximity transducer installations. It is intended for applications requiring an externally mounted probe housing in accordance with API 670 machinery protection practices. This configuration includes a 3300 XL 8 mm proximity probe with connector protector and selectable hazardous-area approvals (Option 34), a 0.5 m (20 in) probe cable (Option 05), no standoff adapter (Option 00), a 5.6 in (056) probe penetration, one 3/4-14 NPT plug only (Option 04), and a 3/4-14 NPT mounting thread (Option 02). The housing assembly provides a secure installation for the transducer while protecting the probe from industrial environments. When used with compatible Bently Nevada extension cables and Proximitor® Sensors, it forms a complete proximity transducer system for machinery protection and condition monitoring.

Frequently asked questions

Q:What types of measurements does this assembly support?
A:When used with compatible Bently Nevada transducer system components, it supports shaft vibration, shaft position, Keyphasor® reference, and other shaft displacement measurements required for machinery protection and condition monitoring.

Q:Can the 21000-34-05-00-056-04-02 be installed in hazardous locations?
A:Yes. The supplied 3300 XL 8 mm probe includes selectable hazardous-area approvals. When installed with matching approved extension cables and Proximitor® Sensors, the complete transducer system can be used in approved hazardous-area applications.

Q:What is the Bently Nevada 21000-34-05-00-056-04-02 used for?

A:The 21000-34-05-00-056-04-02 is an externally mounted proximity probe housing assembly used to install and protect a reverse-mounted proximity probe on rotating machinery. It provides convenient access for probe adjustment and replacement while supporting continuous machinery condition monitoring.

Application areas

• Steam Turbine Monitoring – Installed on utility and industrial steam turbines to support continuous shaft vibration and shaft position measurement. The reverse-mounted housing allows technicians to adjust or replace the proximity probe from outside the turbine casing during maintenance, reducing service time and minimizing equipment downtime.
• Gas Turbine Packages – Used on gas turbines for power generation and mechanical drive applications. The housing assembly protects the 3300 XL 8 mm proximity probe while providing stable installation for continuous shaft condition monitoring under high-speed operating conditions.
• Centrifugal Compressors – Applied to process and pipeline compressors in oil and gas facilities. The assembly provides a secure mounting point for proximity probes used to monitor shaft vibration and rotational reference signals, helping identify changes in machine condition before failures occur.
• Power Generation Equipment – Installed on turbine generators, exciter shafts, and auxiliary rotating equipment. It provides reliable probe positioning for machinery protection systems that continuously monitor shaft movement and vibration during normal plant operation.

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